What software is it running that make be 3rd party firewall, and so on?
How does the network card look in device manager?
I know this may seem dahh but have you tried a different Ethernet cable? Your not using a cross over cable?
Are you pulling a 169.?
Are you connected to a router or cable modem? If a modem try disconnecting the coax from cable reboot modem ( should enable DHCP internally in the modem) and PC and see if it can pull a 192.
What kind of lights are you getting on the back of the NIC?